The pawn on h4 is not so important for White, who is betting on his c-passer.
24... g6g4 This was Keymer's plan. He is now looking for nice central counter-strikes. 25. g2g3  25... a7a6 Preparing the coming sacrifice. 26. b5b2 Deep prophylaxis, so typical for Carlsen, no matter what the time control is. 26... e7h4 Things are starting to heat up and Keymer is standing strong.